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Grapes are an important crop in Maharashtra, Karnataka, Gujarat and many states farmers are growing this crop. Downy mildew and Powdery mildew diseases are major threats to grapes cultivation. The following chemical control practices are recommended for the management of these diseases.
Downey mildew
Downey mildew
Description: - Downy mildew of grapes occurs in most parts of the world where grapes are grown but favors those regions that experience warm, wet conditions during the vegetative growth of the vine. Downy mildew affects the leaves, fruit, and shoots of grapevines. Losses occur through the death of leaf tissue, low-quality fruit, and weakened young shoots. When weather is favorable and no control measures are taken, downy mildew can easily cause 50-75% crop losses in one season.
Symptoms of Downey Mildew
Symptoms of Downey Mildew
Symptoms of downy mildew are usually first noticed on leaves as yellowish, oily lesions initially visible on the leaf’s upper surface and commonly bound by leaf veins. Soon after the lesions are observed, a white cottony, felt like, or ‘downy’ mass is observed on the corresponding underside of the leaf. This downy growth is distinctive and should not be confused with natural hairiness or pubescence on the lower leaf surface of many grape varieties. Foliar lesions may be numerous enough to cause defoliation, particularly in September and October when spray programs “slack off”. Such defoliation reduces sugar accumulation and decreases cold hardiness. Downy mildew is often observed on young shoot tips and fruit clusters. Infected shoot tips thicken, curl, and become white during sporulation. Eventually, affected tips become brown and die. Similar symptoms may be seen on petioles, tendrils, and young inflorescences.
Management of Downy mildew and Powdery mildew diseases in Grapes
Management of Downy mildew and Powdery mildew diseases in Grapes
A. Bud burst Stage:-
A. Bud burst Stage:-
Grapes are an important crop in Maharashtra, Karnataka, Gujarat and many states farmers are growing this crop. Downy mildew and Powdery mildew diseases are major threats to grapes cultivation. The following chemical control practices are recommended for the management of these diseases.
B. Leaf / Vegetative stage Stage:-
B. Leaf / Vegetative stage Stage:-
Melody® DUO
1St spray:- Melody Duo is applied at the vegetative stage (9-14 days after pruning) at the dose of 900 g per acre.
Aliette®+Antracol®
2nd spray:- Aliette+Antracol is applied at the vegetative stage (15-17 days after pruning). At the dose of Aliette 560-800 gram/ acre & Antracol 300 gm/100 lit of water for effective control.
Melody® DUO
3rd spray:- Melody Duo is applied at the pre-flowering stage (31-35 days after pruning) at the dose of 900 grams per acre
Downey mildew
Downey mildew
Description: - Downy mildew of grapes occurs in most parts of the world where grapes are grown but favors those regions that experience warm, wet conditions during the vegetative growth of the vine. Downy mildew affects the leaves, fruit, and shoots of grapevines. Losses occur through the death of leaf tissue, low-quality fruit, and weakened young shoots. When weather is favorable and no control measures are taken, downy mildew can easily cause 50-75% crop losses in one season.
2nd spray:-
Profiler is applied at the pre-flowering stage (25-30 days after pruning). Dose of 900 to 1000 grams per acre.
Powdery Mildew-Grape
Powdery Mildew-Grape
Description:- Initial symptoms of powdery mildew appear on leaves as chlorotic spots on the upper leaf surface. Signs of the pathogen appear a short time later as white, webby mycelium on the lower leaf surface. As spores are produced, the infected areas take on a white, powdery, or dusty appearance. On fruit and rachises, the pathogen appears as white, powdery masses that may colonize the entire berry surface.
Symptoms of Powdary Mildew :-
Symptoms of Powdary Mildew :-
Symptoms of Downey Mildew
Symptoms of downy mildew are usually first noticed on leaves as yellowish, oily lesions initially visible on the leaf’s upper surface and commonly bound by leaf veins. Soon after the lesions are observed, a white cottony, felt like, or ‘downy’ mass is observed on the corresponding underside of the leaf. This downy growth is distinctive and should not be confused with natural hairiness or pubescence on the lower leaf surface of many grape varieties. Foliar lesions may be numerous enough to cause defoliation, particularly in September and October when spray programs “slack off”. Such defoliation reduces sugar accumulation and decreases cold hardiness. Downy mildew is often observed on young shoot tips and fruit clusters. Infected shoot tips thicken, curl, and become white during sporulation. Eventually, affected tips become brown and die. Similar symptoms may be seen on petioles, tendrils, and young inflorescences.
A.Flower initiation and Flowering stage
A.Flower initiation and Flowering stage
NATIVO®
1st Spray:- Nativo is applied at the pre-flowering stage (20-25 days after pruning).Nativo at the dose of 70 grams per acre.
Luna® Experience
Luna® Experience
2nd Spray:-
Luna Experience is applied at the flowering stage (36-40 days after pruning). One or two sprays shall be given at 10-15 days intervals at the dose of 225 ml per acre 3rd spray:- Luna Experience is applied at the berry setting stage (46-50 days after pruning). At the dose of 225 ml per acre.
Spray schedule For Downey Mildew
